v23.xml 146 B

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  1. <!DOCTYPE doc [
  2. <!ELEMENT doc (a?, (b, c?)?, d)>
  3. <!ELEMENT a EMPTY>
  4. <!ELEMENT b EMPTY>
  5. <!ELEMENT c EMPTY>
  6. <!ELEMENT d EMPTY>
  7. ]>
  8. <doc>
  9. <d/>
  10. </doc>